Centrifugal expanding collet



Aug. 15, 1950 E. w. KE'ENEY CENTRIFUGAL EXPANDING COLLET 2 Sheeds-Sheet 1 Filed April 22, 1946 INVENTOR.

0 Edward- W Keeney ATTD RN EYS Aqg- 1950 E. w. KEENEY 2,519,139

CENTRIFUGAL EXPANDING COLLET Filed April 22, 1946 r 2 Sheets Sheet 2 INVENTOR. Edward W. /(c-*en Patented Aug. 15, 1950 UNITED STATES PATENT OFFICE CENTRIFUGAL EXPANDING C'OLLET Edward W. Keeney, Westfield, Mass.

Application April 22, 1946, Serial No. 664,095

1 Claim. 1

This invention relates to an improved polishing and screw machine centrifugal expanding collet.

An object of this invention is to provide a collet utilizing only one body having removable jaws therein which are not spring tensioned but are controlled by centrifugal force.

Another object of the invention is to provide a collet that is durable in use, eificient in operation and can be inexpensively manufactured.

With the above and other objects and ad-v vantages in view the invention consists of the novel details of construction, arrangement and combination of parts more fully hereinafter described, claimed and illustrated in the accompanying drawings in which:

Figure 1 is an elevational view of an embodi-' ment of the invention;

Figure 2 is a front end view thereof;

Figure 3 is a sectional view on the line 3--3 of Figure 2;

Figure 4 is the same with the jaws moved outwardly; l

Figure 5 is a sectional view on the line 5-5 of Figure 1;

Figure 6 is a perspective view of one of the laws;

Figure 7 is a sectional view of a modified form of the invention;

Figure 8 is a perspective view of a modified form of jaw;

Figure 9 is a view of another modified form of the invention and Figure 10 is a sectional view on the line Ill-l0 of Figure 9.

Referring more in detail to the drawing the reference numeral 20, designates the hollow body of the collet having the enlarged head 22 and the reduced threaded portion 24 which is provided with seats 26 to receive the jaws 28 which are pivotally mounted therein by screws 30, the heads of which are received in countersinks 32 and elongated slots 34 receive the jaws so that the jaws are seated within the portion 22 and the portion at its outer periphery is provided with opposed slots 36 to provide a break edge.

The jaws 28 are provided with tapered pressure teeth 38 having an arcuate face 40 and the point of pressure of the teeth are in the center of the face 40 thereof.

In Figures 7 and 8 the jaws 28 are shown provided with pins 42 for replacement of the screws 30 and the pins 42 are seated in a ground annular slot 44 positioned at the rear of the portion 22 in the body 20. i

In Figures 9 and 10 the portion 22 is provided with an annular groove 46 to receive the pins 48 which are mounted in the jaws 50 at the forward end thereof, and the jaws 50 are mounted in the slots 52 in the body Zil and portion 22 and the rear end of the jaws 5d are provided with a recessed gripping area 54 which is also arcuate shaped in cross section.

The jaws are made of hardened steel but there being no wear on the body it can be made of a cheaper grade of steel and then case hardened.

Thus there has been provided a collet which eliminates the use of springs having the jaws actuated by centrifugal force which jaws are easily replaced for the renewal thereof.

It is believed that the operation and construction of the collet will be apparent to those skilled in the art and it is to be understood that changes in the details of construction, arrangement and combination of parts may be resorted to provided they fall within the spirit of the invention and the scope of the appended claim.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

A collet construction comprising in combination, an elongated body having a, forward head end portion provided with a forward end face and an axial bore therethrough, said head end portion provided with circumferentially spaced peripheral grooves on the outer side thereof extending longitudinally inwardly from the forward face thereof and terminating intermediate the ends of the body which are open outwardly of the body throughout their length, said head portion provided with longitudinal slots connecting I said grooves and bores and extending inwardly REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Barber Sept. 26, 1905 Number Number Number Name Date Richards Apr. 17, 1906' Delany Aug. 11, 1908 Helms Oct. 14, 1913 Olson Feb. 21, 1922 Seng Sept. 11, 1923 Johnson Aug. 22, 1944 Crowley July 30, 1946 FOREIGN PATENTS Country Date Great Britain Mar. 30, 1922 

